That was my thought, but no; the depth stop is in place and somewhat longer than the 'spare' lying in the box. Contacted Ryobi but they haven't been able to figure it out yet.
For anybody interested, Ryobi have concluded that the errant nut/bolt is not part of the tool and must have erroneously slipped into the box during the manufacturing/packing process.
Thought it best to check, I quite like my fingers attached to my hands after all.
After-sales service from CBS Power Tools/Techtronic Industries (UK) Ltd (who operate Ryobi-direct.com) was absolutely top notch. Problem identified and solution offered in a matter of hours and the replacement button cap has been sent out in the post same day.
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